Writing instrument



FIG. 1 is a perspective view of a writing instrument showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof, with the left side view being a mirror image thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a perspective view of the writing instrument shown in FIG. 1, with the end-cap removed therefrom;

FIG. 8 is a front view thereof with the right-side, left-side, rear views being a mirror images thereof;

FIG. 9 is a top view thereof; and,

FIG. 10 is a bottom view thereof. 

The ornamental design for a writing instrument, as shown and described. 